Tuyeres



United States Patent Eric Peel 5 Rockclifle Terrace, Carlin How, Yorkshire, England Appl. No. 744,137

Filed July 11, 1968 lnventor Patented Nov. 17, 1970 Priority July 13, 1967 Great Britain 32,315/67 TUYERES 8 Claims, 2 Drawing Figs.

US. Cl 122/6.6; 266/41 Int. Cl. F22b 37/00 Field olSearch 1 10/1825;

m13,s40,41s

[56] References Cited UNITED STATES PATENTS 203,056 4/1878 Mackey l22/6.6 254,433 2/1882 Didier 122/6.6 2,540,231 2/1951 Avery et al. l22/6.6X 3,052,219 9/1962 Haack, Jr. l22/6.6

Primary Examiner- Kenneth W. Sprague Attorney- Stevens, Davis,' Miller & Mosher ABSTRACT: A tuyere comprises an annular hollow body whose interior is divided by a transverse partition into nose and rear portions, and means for circulating coolant through said portions simultaneously, the circulating means allowing coolant to be circulated through the rear portion over substantially the whole area of the partition when circulation through the nose portion isinterrupted. e.g. because of damage to the nose of the tuyere.

Patented Nov. 17, 1970 Sheet Invenlor ERIC PEEL Patented Nov. 17, 1970 3,540,418

Sheet 2 of 2 Inventor ERIC PEEL A Ilorneys TUYERES This invention is concerned with tuyeres and like nozzles (all hereinafter referred to astuyeres) for introducing air or other gasses into furnaces or other high temperature enclo sures.

Tuyeres are subjected to very high temperatures in use and are therefore made with hollow bodies through which cooling water is passed. The front or nose of a tuyere is particularly prone to damage. If the nose fractures or is damaged so that water escapes, replacement of the tuyere becomes urgent and very substantial expense may arise in making an unplanned and sudden shutdown of the furnace.

It is an object of the present invention to provide a tuyere which can continue to be used after fracture of the nose so that more time is available to arrange for the furnace to be shut down for replacement of the tuyere.

According to the invention, a tuyere comprises an annular hollow body having a transverse internal annular partition adjacent the front end of the body and dividing the interior of the body into nose and rear portions for passage of coolant, and means for circulating coolant through the nose and rear portions simultaneously, the rear portion having circulating means operable independently of the circulating means for the nose portion whereby coolant can be circulated through only the rear portion over substantially the whole area behind the partition without passing into the nose portion.

When the tuyere is in normal use, water is circulated through both the nose and rear portions. However, if the nose of the tuyere becomes damaged so that water escapes from the nose portion of the body interior, the supply of water to the nose portion is discontinued while the supply of water to the rear portion is maintained. Since coolant is circulated over substantially the whole area behind the partitions, the fractured nose is still cooled sufficiently to permit continued operation of the tuyere. The parts of the tuyere to the rear of the nose are of course still being cooled as before by the water passing through the rear portion.

As regards the above reference to the fact that the partition is adjacent the front end of the body, it will therefore be understood that this reference signified only that the partition should be sufficiently close to the front end of the body to permit of adequate cooling of the nose by water passing through only the rear portion of the body interior.

The following is a description, by way of example, of embodiments of the present invention, reference being made to the accompanying drawings, in which FIG. 1 is a longitudinal section through a tuyere, and

FIG. 2 is a rear view of the tuyere of FIG. 1.

The tuyere has an annular hollow body formed by a cast copper front part 1 fitted into a cast copper rear part 2 and secured thereto by rods 3. The front part 1 has a transverse internal annular partition 8 adjacent the forward end of the body, which partition divides the interior of the body into a nose portion 5 and a rear portion 6 for passage of cooling medium. The rods 3 extend through the rear portion 6, being in threaded engagement at one end with the partition 8 and at the other end with nuts 9 bearing against the back of the rear part 2. The front part 1 therefore contains the nose portion 5 and cooperates with the rear part 2 to provide the rear portion 6,

The nose portion 5 has an inlet 10 in the partition 8, which inlet receives an end of an inlet pipe 11 which extends through the rear portion 6 to outside the tuyere. The nose portion 5 also has an outlet fitted with a pipe 14 having a nonreturn valve and leading into the rear portion 6. Thus, water can be supplied to the nose portion without entering the rear por tion and, after circulating round the nose portion, passes out into the rear portion. The rear portion 6 has an inlet 12 and an outlet 17.

In use, cooling water is supplied through the pipe 11 and the inlet 12 so that water circulates simultaneously through the nose portion 5 and the rear portion 6. Water leaves the tuyere through the common outlet 17. If damage occurs to the nose of the tuyere so that water leaks, the water supply to the pipe 11 is cut off by a suitable valve but supply of water to the inlet 12 is continued. Thus water ceases to circulate through the nose portion 5 but continues to circulate through the rear portion 6. The nonreturn valve 15 prevents water from passing through the pipe 14 into the nose portion 5. Since water circulates over substantially the whole area behind the partition 8 (namely, for the whole area behind the partition except for the spaces occupied by the rods 3 and the pipes 11 and 14) the nose of the tuyere continues to be sufficiently cooled and since there is no longer any water leakage, the tuyere can remain in use until it is more convenient to replace it.

In a modification of the tuyere described above, the nonreturn valve 15 is omitted and the pipe 14 is extended rearwardly outside the tuyere so that water from the rear portion 6 cannot enter the nose portion 5.

The front part 1 can be replaced if damaged.

If desired the tuyere may be cast in one piece instead of in two separate parts.

The tuyere may, instead of being shaped as illustrated, be an angle tuyere or a dipper tuyere.

lclaim:

l. A tuyere comprising an annular hollow body having a transverse internal annular partition adjacent the front end of the body and dividing the interior of the body into nose and rear portions for passage of coolant, said partition being made in one piece with the nose portion and with at least a substantial adjacent portion of the rear portion, and means for circulating coolant through the nose and rear portions simultaneously, the rear portion having circulating means operable independently of the circulating means for the nose portion whereby coolant can be circulated through only the rear portion whereby coolant can be circulated through only the rear portion over substantially the whole area behind the partition without passing into the nose portion.

2. A tuyere according to claim 1 in which the body comprises two abutting parts, one part comprising the nose por tion, the partition and the adjacent portion of the rear portion and the other part comprising the remainder of the rear portion, and tie rods are provided connecting the partition and the rear portion thereby securing said two parts together.

3. A tuyere according to claim 1 in which said body is a onepiece casting.

4. A tuyere according to claim 1 in which said circulating means comprise an inlet passage and an outlet passage passing through the rear portion and opening into the nose portion and an inlet and an outlet for the rear portion.

5. A tuyere according to claim 1 in which said circulating means comprise an inlet passage passing through the rear portion and opening into the nose portion, an outlet with a nonreturn valve from the nose portion to the rear portion and an inlet and an outlet for the rear portion.

6. A tuyere according to claim 1 in which said partition has a rear annular face with radially inner and outer peripheral portions which are unobstructed for their whole length to the passage of coolant thereover, substantially the whole of said face between said peripheral portions being contactable by coolant.

7. A tuyere comprising an annular body having nose and rear portions with separate passageways therethrough for coolant, and means for circulating coolant through the passageways inthe nose and rear portions simultaneously, said rear portion having circulating means operable independently of the circulating means for the nose portion whereby coolant can be circulated through only the rear portion behind substantially the whole of the nose portion without passing into the nose portion, and the nose portion being made in one piece with at least a substantial adjacent portion of the rear portion.

8. A tuyere comprising an annular hollow body having a transverse internal annular partition adjacent the front end of the body and dividing the interior of the body into nose and rear portions for passage of coolant, and means for circulating prise an inlet passage passing through the rear portion and opening into the nose portion, an outlet with a nonreturn valve from the nose portion to the rear portion and an inlet and an outlet for the rear portion. 

